Process for cleaning electronic or precision parts and recycling rinse waste water

A process for cleaning an electronic or precision part, which comprises the steps:

• (1) contacting an electronic or precision part with a detergent composition wherein said detergent composition consists essentially of 2-100% of one or more nonionic surface active agents and up to 5% by wt. of an anionic surfactant wherein a 5% by weight aqueous solution of said detergent composition has a cloud point of 5.degree.-100.degree. C., or with an aqueous solution of said detergent composition, wherein said contacting is carried out at a temperature below the cloud point of said detergent composition or said aqueous solution of said detergent composition, to obtain a washed electronic or precision part;
• (2) rinsing said washed electronic or precision part with rinse water at a temperature of 5.degree.-100.degree. C., to obtain rinse waste water and a rinsed electronic or precision part;
• and
• (3) heating said rinse waste water to a temperature above its cloud point, to obtain (a) an aqueous phase comprising purified rinse waste water and (b) an oil component phase,
• wherein said rinse water in said rinsing (2) is purified rinse waste water obtained from said heating (3).